Preparation method of porous carbon adaptive to non-expansion silicon-carbon negative electrode battery

Through spraying and heat treatment, porous carbon is formed, and combined with carbon dioxide activation, the battery performance problems caused by volume changes in silicon during the deintercalation of lithium are solved, and the overall zero expansion of silicon carbon negative electrode and battery performance improvement are achieved.

CN119706787APending Publication Date: 2025-03-28SHENZHEN NINGSHI MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202411800543.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

In the prior art, the volume of silicon changes greatly during the deintercalation of lithium, resulting in cracking and powderization of the active material, and deteriorating contact with the current collector, affecting the cycling performance and stability of the battery.

Method used

A method of preparing porous carbon for non-expandable silicon carbon negative electrode batteries is adopted to form porous carbon by spraying and heat treatment, and combined with carbon dioxide activation, porous carbon materials with controllable particle size and pore size are prepared.

Benefits of technology

The demand for overall zero expansion of silicon carbon negative electrode is achieved, the circulation performance and stability of the battery is improved, and the synthesis process is simple, the equipment investment is small, and the environmental pollution is small.

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Abstract

The invention discloses a preparation method of porous carbon for a battery adaptive to an unexpanded silicon-carbon negative electrode, and belongs to the technical field of preparation methods of porous carbon, the synthesized porous carbon is controllable in particle size and pore diameter, and the specific surface and other technical indexes meet the requirements of the porous carbon of the silicon-carbon negative electrode. The hollow spherical porous carbon is internally provided with a space for silicon to expand in the charge-discharge process, so that the requirement of zero expansion of the whole silicon-carbon negative electrode is met to a certain extent; the preparation method is simple in process, and the porous carbon with the specific surface larger than 1100g / m < 2 > can be prepared without activation. After carbon dioxide is used for activation, the specific surface area can reach 1400 m < 2 > / g; the synthetic raw materials are simple, easy to obtain, mature, stable and low in price, and meet the batch delivery stability.
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